Stator wire rod insulation onsite repairing method for large generator

Abstract

The invention discloses a stator wire rod insulation onsite repairing method for a large generator. The stator wire rod insulation onsite repairing method uses materials of a mica tape with low dosage of adhesive, a mica tape with high dosage of adhesive, room-temperature cured epoxy resin adhesive, a pre-impregnated glass tape (PG band) and the like; a main insulation damaged part of the stator wire rod is repaired on the site of accident of the generator; through a reasonable and reliable repairing process, the main insulation repairing of the wire rod is completed within a short time; it is ensured that the repaired stator winding can satisfy long-term, stable and reliable operational requirements of a machine set; meanwhile, a technological process of stator wire rod insulation onsite repairing for the large generator is specified; all repaired machine sets are re-input into operation; the repaired winding is excellent and reliable in insulation performance; and compared with a former generator accident treatment method, the stator wire rod insulation onsite repairing method can ensure the repairing quality, avoid disassembling and replacing of the stator wire rod, save a huge repairing cost, greatly shorten the rush repairing period, and has great economic benefit and social benefit.

Description

[0001] Technical field: [0002] The invention relates to a field repair method for the insulation of a large-scale generator stator wire rod. [0003] Background technique: [0004] Defects in the design and manufacture, problems in the installation process, and errors in operation and maintenance may cause damage to the main insulation of the stator bar during the operation of large generators. The conventional repair method is to use multi-adhesive mica tape and room temperature curing epoxy resin , fill up the damaged part and then bandage and cure it. Due to the low mica content in the multi-glue mica tape and the high curing temperature of the epoxy glue, it is difficult to fully cure on site, so it is difficult to ensure the electrical strength of the main insulation on site after repair. and long-term insulation performance, so the damaged stator bar can only be lifted out of the stator core slot, and the less damaged stator bar is repaired with multi-glue mica tape, wh...

AI Technical Summary

Problems solved by technology

[0004] Defects in the design and manufacture, problems in the installation process, and errors in operation and maintenance may cause damage to the main insulation of the stator bar during the operation of large generators. The conventional repair method is to use multi-adhesive mica tape and room temperature curing epoxy resin , fill up the damaged part and then bandage and cure it. Due to the low mica content in the multi-glue mica tape and the high curing temperature of the epoxy glue, it is difficult to fully cure on site, so it is difficult to ensure the electrical strength of the main insulation on site after repair. and long-term insulation performance, so the damaged stator bar can only be lifted out of the stator core slot, and the less damaged stator bar is repaired with multi-glue mica tape, while the slightly damaged stator bar is often It can only be scrapped and replaced with new wire rods. This repair method leads to problems such as poor repair quality, long repair period, and high repair cost in the on-site repair of stator wire rods.

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